From glowscript.org, "GlowScript is an easy-to-use, powerful environment for creating 3D animations and publishing them on the web. The design of GlowScript is based on that of VPython. Development of GlowScript was initiated by David Scherer and Bruce Sherwood in the summer of 2011."

Just like with GlowScript, you don't need to import any extra modules to get started. Visit the GlowScript Help pages for information on what types of objects, events, and other graphing functionality is available.